CN112460252A - Intelligent gear shifting method and device based on double clutches - Google Patents
Intelligent gear shifting method and device based on double clutches Download PDFInfo
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- CN112460252A CN112460252A CN202011315339.2A CN202011315339A CN112460252A CN 112460252 A CN112460252 A CN 112460252A CN 202011315339 A CN202011315339 A CN 202011315339A CN 112460252 A CN112460252 A CN 112460252A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0403—Synchronisation before shifting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0403—Synchronisation before shifting
- F16H2061/0407—Synchronisation before shifting by control of clutch in parallel torque path
Abstract
The invention discloses an intelligent gear shifting method based on double clutches, which comprises the following steps: acquiring a current gear and a target gear of a vehicle; judging whether the current gear and the target gear meet preset conditions or not; if the vehicle gear shifting meets the preset condition, respectively controlling the output torque unloading of the first power device and the transmission torque unloading of the current clutch so as to enable the rotating speed of the first power device to be synchronous with the rotating speed corresponding to the target gear; and after the rotating speed of the first power device is synchronous with the rotating speed corresponding to the target gear, controlling the output shaft of the first power device to be gradually opened with the current clutch and gradually engaged with the target clutch so as to enable the output torque of the first power device to be synchronous with the torque corresponding to the target gear. The invention has the advantages of ensuring no power interruption or power loss in the gear shifting process, reducing the sliding friction of the clutch in the gear shifting process and better protecting the clutch while shifting gears more smoothly and quickly.
Description
Technical Field
The invention relates to the field of vehicle control, in particular to an intelligent gear shifting method and device based on double clutches.
Background
In the prior art, when a vehicle shifts gears, such as downshifts, the engine speed is increased by increasing the engine torque, but this can cause wear of the clutch. Particularly, the hybrid power/plug-in hybrid power automobile developed based on DCT (double clutch transmission) has the advantages that the automobile weight is greatly increased compared with that of the original automobile, the working condition that the clutch slips and rubs the engine is increased, and the abrasion consumption of the double clutch is larger. FIG. 9 is a timing diagram illustrating various stages of a current power-on downshift, taking the engine from fifth gear down to fourth gear as an example. Specifically, the method comprises the following stages: (1) the engine is in the fifth gear, and the clutch is locked. (2) Preparation before shifting is started, and pre-gear engagement is realized by the four gears on the even-numbered shafts. (3) The rotation speeds are synchronized. The torque transmitted by the odd-shaft clutch is reduced to the torque of the crankshaft of the engine, so that micro-slip control is realized; the even number of clutches are filled with oil to Kisspoint points (a semi-linkage point: the combination of a main driving plate and a driven plate, and the transmitted torque is zero); the engine speed and the even number shaft input shaft speed are synchronized by the following method: the engine increases the torque, so that the torque of the crankshaft of the engine is larger than the torque transmitted by the clutch (the sum of the torques transmitted by the odd-numbered clutch and the even-numbered clutch), and the rotating speed of the engine rises until the rotating speed of the engine is synchronous with the rotating speed of the even-numbered clutch. (4) And (6) torque interaction. The odd clutch is slowly opened, and the transmitted torque slowly drops; the even number clutch is slowly closed, and the transmitted torque slowly rises; the torque of the crankshaft of the engine is transmitted to the wheel end through the transmission torque of the two clutches, and the engine rotating speed and the rotating speed of the even number input shaft keep a slight slip state. The torque transmitted to the wheel end is changed due to the change of the transmission ratio, and the driving torque transmitted to the wheel end is kept stable and unchanged by adjusting the torque of the crankshaft of the engine. In this stage, the gear ratio is increased due to the downshift, and therefore the engine crankshaft torque is adjusted to decrease the engine torque. (5) The torque transmission paths are all cut into the propeller shaft in which the target gear is located. The even-numbered shaft clutch remains slightly slipping and the odd-numbered clutch is opened. (6) The even numbered clutches lock up and the shift is over. If the target gear is on the same shaft as the current gear, for example, the fifth gear is directly shifted down to the third gear, the shift sequence is shown in fig. 10. Specifically, (1) the engine is in the fifth gear, and the clutch is locked. (2) Preparation before gear shifting is started, a fourth gear on an even shaft is engaged, and a third gear on an odd shaft is engaged to a synchronization point; the even number clutch is filled with oil to a Kisspoint point (a semi-linkage point: the combination of a main driving disk and a driven disk, and the transmitted torque is zero), the odd number clutch is converted from a locking state to transmit the torque to the engine crankshaft torque, and the driving torque transmitted to the wheel end is ensured to be consistent with that before the gear shifting is started. And increasing the torque of the crankshaft of the engine, thereby realizing the increase of the rotating speed of the engine to the rotating speed of the input shaft of the even number shaft. (3) The first torque interaction is realized, the torque of the crankshaft of the engine is transmitted to the path of the wheel end, and the torque is transmitted to the even-numbered shaft clutch by the odd-numbered shaft clutch, so that the driving torque transmitted to the wheel end is consistent with the torque required by a driver, and the smoothness of the whole vehicle is realized. (4) And synchronously increasing the torque of the crankshaft of the engine at the speed, and continuously increasing the rotating speed of the engine to the rotating speed of the odd input shaft corresponding to the target gear. The even number shaft clutches execute sliding friction, and the driving torque transmitted to the wheel end is ensured to be consistent with the torque required by a driver, so that the smoothness of the whole vehicle is realized. And the fifth gear of the engine is withdrawn, and the third gear is engaged. (5) And the second torque interaction is carried out on a path from the engine crankshaft torque to the wheel end, and is transferred from the even-numbered shaft clutch to the odd-numbered shaft clutch, so that the driving torque transferred to the wheel end is consistent with the torque required by a driver, and the smoothness of the whole vehicle is realized. (6) And locking the odd-numbered clutch, recovering the engine crankshaft torque and the motor torque to normal torque values, and finishing the gear shifting.
Disclosure of Invention
The technical problem to be solved by the invention is to avoid wearing a clutch when a vehicle shifts gears; especially on the basis of DCT inserts electric hybrid or hybrid vehicle, reduce the smooth friction of double clutch, better protection double clutch.
In order to solve the technical problem, the invention discloses an intelligent gear shifting method based on a double clutch, which comprises the following steps:
acquiring a current gear and a target gear of a vehicle;
judging whether the current gear and the target gear meet preset conditions or not;
if the vehicle gear shifting meets a preset condition, respectively controlling the output torque unloading of a first power device and the transmission torque unloading of a current clutch so as to enable the rotating speed of the first power device to be synchronous with the rotating speed corresponding to the target gear;
and after the rotating speed of the first power device is synchronous with the rotating speed corresponding to the target gear, controlling the output shaft of the first power device to be gradually opened with the current clutch and gradually engaged with the target clutch so as to enable the output torque of the first power device to be synchronous with the torque corresponding to the target gear.
Further, the preset condition includes that the target gear is smaller than the current gear.
Further, if the target gear and the current gear are adjacent gears,
the separately controlling the unloading of the output torque of the first power unit and the unloading of the transfer torque of the present clutch includes:
and controlling the output torque of the first power device to be unloaded according to a first slope, and controlling the transmission torque of the current clutch to be unloaded according to a second slope, wherein the first slope is smaller than the second slope.
Further, the controlling the output shaft of the first power unit to be gradually opened with the current clutch and gradually engaged with the target clutch includes:
when the output shaft of the first power device and the current clutch are controlled to be gradually opened, controlling the transmission torque of the target clutch to be loaded so that the transmission torque of the target clutch is loaded to the torque corresponding to the target gear;
and when the transmission torque of the target clutch is loaded to the torque corresponding to the target gear, controlling the output shaft of the first power device to be gradually engaged with the target clutch.
Further, before controlling the unloading of the output torque of the first power plant and the unloading of the transfer torque of the current clutch, respectively, the intelligent shifting method further comprises:
and controlling the target clutch to perform pre-gear engagement so that the target clutch is pre-engaged to the target gear.
Further, if the target gear and the current gear are the interval gears,
the separately controlling the unloading of the output torque of the first power unit and the unloading of the transfer torque of the present clutch includes:
controlling the output torque of the first power device to be unloaded according to a third slope, and controlling the transmission torque of the current clutch to be unloaded according to a fourth slope, so that the current clutch is released from a locking state, wherein the third slope is smaller than the fourth slope;
when the current clutch is unlocked, controlling the output torque of the first power device to be transferred from the current clutch to an intermediate clutch so that the intermediate clutch performs friction control on the first power device;
and after the output torque of the first power device is transferred from the current clutch to the intermediate clutch, controlling the transfer torque of the target clutch to be unloaded so as to synchronize the rotating speed of the first power device with the rotating speed corresponding to the target gear.
Further, the controlling the output shaft of the first power unit to be gradually opened with the current clutch and gradually engaged with the target clutch includes:
when the output shaft of the first power device and the intermediate clutch are controlled to be gradually opened, controlling the transmission torque loading of the target clutch and the output torque loading of the first power device so as to load the transmission torque of the target clutch to the torque corresponding to the target gear;
and when the transmission torque of the target clutch is loaded to the torque corresponding to the target gear, controlling the output shaft of the first power device to be gradually engaged with the target clutch.
Further, before controlling the unloading of the output torque of the first power plant and the unloading of the transfer torque of the current clutch, respectively, the intelligent shifting method further comprises:
controlling the intermediate clutch to perform pre-gear so that the intermediate clutch is pre-geared to the intermediate gear;
and after controlling the output shaft of the first power unit to be gradually opened with the current clutch and gradually combined with the intermediate clutch, and before controlling the output shaft of the first power unit to be gradually engaged with the target clutch, the smart shift method further includes:
and controlling the target clutch to perform pre-gear engagement so that the target clutch is pre-engaged to the target gear.
Further, the intelligent gear shifting method further comprises the following steps:
and when the transfer torque of the current clutch is controlled to be unloaded, compensating the transfer torque of the current clutch through a second power device so as to enable the driving torque of the wheel end of the vehicle to be unchanged.
The invention also provides an intelligent gear shifting device based on the double clutches, which comprises:
the gear acquisition module is used for acquiring the current gear and the target gear of the vehicle;
the preset condition judgment module is used for judging whether the current gear and the target gear meet preset conditions or not;
the rotating speed synchronous control module is used for respectively controlling the unloading of the output torque of the first power device and the unloading of the transmission torque of the current clutch if the vehicle gear shifting meets a preset condition so as to enable the rotating speed of the first power device to be synchronous with the rotating speed corresponding to the target gear;
and the engagement control module is used for controlling the output shaft of the first power device and the current clutch to be gradually opened and gradually engaged with the target clutch after the rotating speed of the first power device is synchronized with the rotating speed corresponding to the target gear, so that the output torque of the first power device is synchronized with the torque corresponding to the target gear.
The invention also provides a computer readable storage medium, wherein at least one instruction or at least one program is stored in the storage medium, and the at least one instruction or the at least one program is loaded by a processor and executed to realize the intelligent double-clutch-based gear shifting method.
The invention also provides a double-clutch-based gear shifting device which is characterized by comprising a processor and a memory, wherein at least one instruction or at least one program is stored in the memory, and the at least one instruction or the at least one program is loaded and executed by the processor to realize the double-clutch-based intelligent gear shifting method.
By adopting the technical scheme, the invention has the following beneficial effects: the power-free interruption or power loss in the gear shifting process can be guaranteed, the smooth and quick gear shifting is realized, the sliding friction of the clutch in the gear shifting process is reduced, and the clutch is better protected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a hybrid power system provided in the practice of the present invention;
FIG. 2 is a schematic flow chart of an intelligent dual-clutch-based gear shifting method according to the embodiment of the invention;
FIG. 3 is a schematic flow chart of another dual clutch based intelligent shifting method according to the present invention;
FIG. 4 is a schematic flow chart of an intelligent gear shifting method implemented according to the present invention when a target gear and a current gear are adjacent gears;
FIG. 5 is a timing diagram illustrating a power downshift shift in accordance with an embodiment of the present invention;
FIG. 6 is a schematic flow chart of an intelligent shifting method implemented according to the present invention when the target gear and the current gear are different gears;
FIG. 7 is a timing diagram illustrating a continuous power downshift shift in accordance with an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an intelligent dual clutch based gearshift device according to the present invention;
FIG. 9 is a timing diagram for a prior art power downshift shift provided by the present invention implementation;
FIG. 10 is a timing diagram for an implementation of the present invention to provide a prior art continuous power downshift shift.
The following is a supplementary description of the drawings:
1-odd-number shaft clutch; 2-even number shaft clutch; 3, a motor; 4-intelligent gear shifting devices; 401-gear acquisition module; 402-a preset condition judgment module; 403-rotating speed synchronous control module; 404-engage the control module.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
Example (b):
in a vehicle type equipped with a dual clutch transmission, the engine transmits the output torque of the power unit to the wheel ends of the drive wheels through an odd-numbered shaft clutch 1 and an even-numbered shaft clutch 2. The invention takes a P2.5 hybrid system as an example, and as shown in fig. 1, is a schematic structural diagram of the hybrid system. The odd-numbered shaft clutch 1 is connected with the 1 gear, the 3 gear, the 5 gear and the 7 gear and is used for transmitting the torque of the odd-numbered gears; connected with gears 2, 4, 6 and Rev are the even-numbered shaft clutches 2 for transmitting torque in the even-numbered gears.
The invention provides an intelligent gear shifting method based on a double clutch based on the hybrid power system, as shown in fig. 2, the intelligent gear shifting method may include:
s100: and acquiring the current gear and the target gear of the vehicle.
In specific implementation, the current gear may be any gear of the vehicle, that is, an odd gear, an even gear, or other gears; the target gear may be any gear. In the embodiment of the present invention, only the following gears are exemplified, but it should be understood that other gear shifting modes according to the present invention should also fall within the protection scope of the present invention.
S300: and judging whether the current gear and the target gear meet preset conditions.
In some possible embodiments, the preset condition includes that the target gear is smaller than the current gear. That is, the preset condition may be a vehicle downshift. It should be noted that the embodiment of the present invention is illustrated as a vehicle downshift, but other shifting manners consistent with the present invention should also fall within the protection scope of the present invention.
S500: and if the vehicle gear shifting meets the preset condition, respectively controlling the output torque unloading of the first power device and the transmission torque unloading of the current clutch so as to enable the rotating speed of the first power device to be synchronous with the rotating speed corresponding to the target gear.
S700: and after the rotating speed of the first power device is synchronous with the rotating speed corresponding to the target gear, controlling the output shaft of the first power device to be gradually opened with the current clutch and gradually engaged with the target clutch so as to enable the output torque of the first power device to be synchronous with the torque corresponding to the target gear.
In specific implementation, taking a vehicle downshift as an example, in the prior art, the output torque of an engine is increased, so that the crankshaft torque of the engine is greater than the torque transmitted by a clutch, even if the crankshaft torque of the engine is greater than the sum of the torques transmitted by an odd shaft clutch and an even shaft clutch, so that the engine speed is increased to the speed of a target gear, the clutch and the engine are in slip control, excessive wear of the clutch can be caused, and when the clutch is applied to a plug-in hybrid vehicle, the clutch can be damaged by ablation. In the embodiment of the invention, the torque of the first power device and the current clutch is unloaded, so that the rotating speed of the first power device is synchronous with the rotating speed corresponding to the target gear, and the sliding friction of the clutch in the gear shifting process is reduced and the clutch is protected when the first power device and the target clutch perform torque interaction. By the implementation mode of the invention, the sliding friction of the clutch in the gear shifting process can be reduced and the clutch can be better protected while the gear shifting process is ensured to be free from power interruption or power loss and is smoother and faster.
In some possible embodiments, as shown in fig. 3, the intelligent shift method may further include:
s900: and when the transfer torque of the current clutch is controlled to be unloaded, compensating the transfer torque of the current clutch through a second power device so as to enable the driving torque of the wheel end of the vehicle to be unchanged.
In specific implementation, the transmission torque of the current clutch is unloaded, so that the driving torque transmitted to the driving wheel end is reduced.
In some possible embodiments, the first power device may be an engine and the second power device may be an electric machine 3. As shown in fig. 1, the electric machine 3 can be connected to the even-numbered gears. Can compensate the moment of torsion that the clutch transmission reduces through motor 3, keep transmitting the moment of torsion that the wheel end unchangeable for it is smooth-going when putting the fender position in whole car switching. In practical implementation, the driving force that the motor 3 can provide can be determined according to the current working power and the power working to the peak value of the motor 3. If the current motor 3 works to the peak power to meet the driving torque requirement of the whole vehicle, the current clutch can be opened, the torque of the engine is used for adjusting the rotating speed of the engine to rise, and then the rotating speed of the engine is synchronized with the rotating speed of the input shaft of the target clutch driven disc. The gear shifting of the double-clutch transmission is implemented by AMT (automatic mechanical transmission) gear shifting with power interruption, so that the slipping of the clutch during the rotation speed synchronization and the torque interaction is avoided.
Embodiments of the present invention are illustrated below in adjacent gear downshifts and in alternate gear downshifts.
In some possible embodiments, as shown in fig. 4, if the target gear and the current gear are adjacent gears, the step S500 may include:
s510: and controlling the output torque of the first power device to be unloaded according to a first slope, and controlling the transmission torque of the current clutch to be unloaded according to a second slope, wherein the first slope is smaller than the second slope.
In specific implementation, the unloading slope of the first power device is controlled to be smaller than the unloading slope of the current clutch, so that the output torque of the first power device can be larger than the transmission torque of the current clutch, and the rotating speed of the first power device is increased at a certain speed until the rotating speed corresponding to the target gear is synchronous. In addition, at the rotating speed synchronization finishing stage, the torque unloading rate of the first power device can be increased, the output torque of the engine is consistent with the transmission torque of the current clutch, and the rotating speed of the engine and the rotating speed of the target clutch are kept in a micro-slip state.
Further, in some possible embodiments, as shown in fig. 4, the step S700 may include:
s711: when the output shaft of the first power device and the current clutch are controlled to be gradually opened, controlling the transmission torque of the target clutch to be loaded so that the transmission torque of the target clutch is loaded to the torque corresponding to the target gear;
s712: and when the transmission torque of the target clutch is loaded to the torque corresponding to the target gear, controlling the output shaft of the first power device to be gradually engaged with the target clutch.
Further, in some possible embodiments, before separately controlling the output torque of the first power unit and the transfer torque of the current clutch to be unloaded, as shown in fig. 4, the intelligent shift method further includes:
s410: and controlling the target clutch to perform pre-gear engagement so that the target clutch is pre-engaged to the target gear.
It will be appreciated that after the speed synchronization, the speed of the first power unit is synchronized with the speed corresponding to the target gear, and the target clutch is already operating at a point of half-coupling (i.e. the master and slave discs are engaged, and the torque transmitted is zero), and the current clutch transmits the output torque of the first power unit. When a torque interaction stage is started, the current clutch is slowly opened, and the transmitted torque slowly drops; the target clutch is slowly closed, and the transmitted torque slowly rises; the output torque of the first power device is transmitted to the wheel end through the transmission torque of the two clutches, and the engine rotating speed and the target clutch input shaft rotating speed are kept in a slightly-slipping state.
If the current gear is a fifth gear and the target gear is a fourth gear, the current clutch is an odd-number shaft clutch and the target clutch is an even-number shaft clutch; the first power unit is an engine, and the second power unit is a motor. In particular, the power downshift process may be divided into several stages according to the time progression, as shown in fig. 5, which is a timing chart of the power downshift.
(1) In the first phase, the engine gear is in fifth gear and the odd-numbered shaft clutch is in a locked state.
(2) In the second phase, preparation before shifting is started, and the fourth gear on the even-numbered shaft is pre-engaged.
(3) In the third phase, the engine speed is synchronized with the fourth gear speed. Specifically, the even number shaft clutches are filled with oil to a half-linkage point, the driving and driven disks are combined, and the transmitted torque is zero. The odd-numbered shaft clutch is opened at a certain speed, the torque of the engine crankshaft is unloaded at a certain speed, and the unloading speed of the torque of the engine crankshaft is smaller than that of the torque transmitted by the odd-numbered shaft clutch, so that the torque of the engine crankshaft is larger than that of the odd-numbered shaft clutch, and the rotating speed of the engine is increased at a certain speed until the rotating speed of the engine crankshaft is synchronous with that of the even-numbered shaft clutch; and at the stage of finishing the synchronization of the rotating speeds, increasing the unloading speed of the torque of the crankshaft of the engine, realizing the consistency of the torque of the crankshaft of the engine and the transmission torque of the clutch of the odd-numbered shaft, and keeping the rotating speeds of the engine and the clutch of the even-numbered shaft in a micro-slip state.
The driving torque transmitted to the wheel end is reduced due to the fact that the torque transmitted by the odd-number shaft clutch is reduced according to a certain speed, and the reduced driving torque of the wheel end is compensated by the driving torque of the motor so as to guarantee that the total driving torque of the wheel end is kept unchanged, and therefore the smoothness of the whole vehicle is guaranteed.
Compared with the gear shifting mode in the stage in the prior art, the torque transmitted by the gear end can be kept unchanged, namely the smoothness of the whole vehicle is the same, the sliding friction of the odd-number shaft clutch is reduced, and the clutch is protected better. The amount by which the clutch slip is reduced is related to the current operating power of the motor and the peak power of the motor. If the current motor works to reach the peak power and can meet the driving torque requirement of the whole vehicle, the odd-number shaft clutch can be opened, the torque of the engine is used for adjusting the rotating speed of the engine to rise, and then the rotating speed of the engine and the rotating speed of the input shaft of the driven plate of the even-number shaft clutch are synchronized. The gear shifting of the double-clutch transmission is implemented by AMT (automatic mechanical transmission) gear shifting with power interruption, so that the slipping of the clutch during the rotation speed synchronization and the torque interaction is avoided.
(4) In the fourth phase, torque interaction of the engine and the even-numbered shaft clutch is achieved. Specifically, after the rotating speed is synchronous, the rotating speed of the engine is synchronous with the rotating speed of the even-number shaft clutch, and the even-number shaft clutch works at a semi-linkage point; the odd-numbered shaft clutch transmits engine crankshaft torque. Entering a torque interaction stage, slowly opening the odd-number shaft clutch, and slowly reducing the transmitted torque; the even-numbered shaft clutch is slowly closed, and the transmitted torque slowly rises; the torque of the crankshaft of the engine is transmitted to the wheel end through the transmission torque of the two clutches, and the engine rotating speed and the rotating speed of the even number input shaft keep a slight slip state.
The torque transmitted to the wheel end is changed due to the change of the transmission ratio, and the driving torque transmitted to the wheel end is kept stable and unchanged by adjusting the torque of the crankshaft of the engine. In this stage, the gear ratio is increased by the downshift, and therefore the engine crankshaft torque is adjusted to be reduced, that is, the engine crankshaft torque is transmitted to the wheel end at the end of the phase of synchronizing the engine crankshaft torque with the rotational speed. In the same way, in the stage, because the state of the reduced torque of the crankshaft of the engine in the stage (3) is continuously maintained, the driving torque of the motor is continuously compensated, so that the total driving torque at the wheel end is kept unchanged, and the smoothness of the whole vehicle is ensured.
In addition, compared with the prior art, the torque of the crankshaft of the engine with the torque interaction is smaller, so that the heat generated by the friction control and the abrasion to the even-numbered shaft clutch are less, and the even-numbered shaft clutch can be protected.
(5) In the fifth phase, the torque transmission paths are all switched into the drive shaft in which the fourth gear is located. The even-numbered shaft clutch keeps slightly sliding, and the odd-numbered shaft clutch is opened.
(6) In the sixth stage, the even-numbered shaft clutch is locked, the engine crankshaft torque and the motor torque are restored to normal torque values, and the gear shift is finished.
In other possible embodiments, if the target gear and the current gear are the intermediate gears. It should be noted that, when the target gear and the current gear are the interval gears, shifting from the current gear to the target gear requires an intermediate gear that undergoes transition and an intermediate clutch. For example, when shifting from fifth gear to third gear, a transition to fourth gear and an even-numbered shaft clutch is required. As shown in fig. 6, the step S500 may include:
s521: and controlling the output torque of the first power device to be unloaded according to a third slope, and controlling the transmission torque of the current clutch to be unloaded according to a fourth slope, so that the current clutch is released from a locking state, wherein the third slope is smaller than the fourth slope.
Before the gear shifting is started, the intermediate clutch achieves pre-engagement of the intermediate gear, the intermediate clutch is filled with oil to a half-linkage point, and the current clutch is changed from a locking state to a state of transmitting the output torque of the first power device, so that the driving torque transmitted to the wheel end is consistent with that before the gear shifting is started. By controlling the unloading slope of the first power device to be smaller than the unloading slope of the current clutch, the output torque of the first power device can be larger than the transmission torque of the current clutch, so that the rotating speed of the first power device rises at a certain rate and gradually rises to the rotating speed corresponding to the intermediate gear.
S522: and after the current clutch is unlocked, controlling the output torque of the first power device to be transferred from the current clutch to an intermediate clutch so that the intermediate clutch performs friction control on the first power device.
When the method is specifically implemented, the intermediate clutch is controlled to be loaded to be level with the output torque of the first power device, so that the output torque of the first power device is transferred to the intermediate clutch from the current clutch, the driving torque transmitted to the wheel end is consistent with the torque required by a driver, and the smoothness of the whole vehicle is realized.
S523: and after the output torque of the first power device is transferred from the current clutch to the intermediate clutch, controlling the transfer torque of the target clutch to be unloaded so as to synchronize the rotating speed of the first power device with the rotating speed corresponding to the target gear.
By controlling the unloading of the transmission torque of the target clutch, the rotation speed of the first power unit can be continuously increased to the rotation speed corresponding to the target gear. During specific implementation, in this stage, the intermediate clutch performs friction-slipping control on the first power device, so that the driving torque transmitted to the wheel end is consistent with the torque required by the driver, and the smoothness of the whole vehicle is realized. In this stage, the target clutch may be controlled to be pre-engaged so that the target clutch is pre-engaged to the target gear.
Further, in other possible embodiments, as shown in fig. 6, the step S700 may include:
s721: when the output shaft of the first power device and the intermediate clutch are controlled to be gradually opened, controlling the transmission torque loading of the target clutch and the output torque loading of the first power device so as to load the transmission torque of the target clutch to the torque corresponding to the target gear;
s722: and when the transmission torque of the target clutch is loaded to the torque corresponding to the target gear, controlling the output shaft of the first power device to be gradually engaged with the target clutch.
Further, in other possible embodiments, as shown in fig. 6, before the unloading of the output torque of the first power plant and the unloading of the transfer torque of the current clutch are separately controlled, the intelligent shifting method further includes:
s421: controlling the intermediate clutch to perform pre-gear so that the intermediate clutch is pre-geared to the intermediate gear;
and after controlling the output shaft of the first power unit to be gradually opened with the current clutch and gradually combined with the intermediate clutch, and before controlling the output shaft of the first power unit to be gradually engaged with the target clutch, the smart shift method further includes:
s422: and controlling the target clutch to perform pre-gear engagement so that the target clutch is pre-engaged to the target gear.
Taking the current gear as a fifth gear and the target gear as a third gear, wherein the current clutch is an odd-number shaft clutch, the target clutch is an odd-number shaft clutch, the intermediate gear is a fourth gear, and the intermediate clutch is an even-number shaft clutch; the first power device is an engine, and the second power device is a motor. In particular, the power downshift process may be divided into several stages according to the time progression, as shown in fig. 7, which is a timing diagram of the continuous power downshift.
(1) In the first phase, the engine gear is in fifth gear and the odd-numbered shaft clutch is in a locked state.
(2) In the second phase, preparation before shifting is started, and the fourth gear on the even-numbered shaft is pre-engaged. The even-numbered shaft clutch is filled with oil to a semi-linkage point, and the odd-numbered shaft clutch is converted from a locking state into transmission torque to be engine crankshaft torque, so that the driving torque transmitted to a wheel end is consistent with that before gear shifting starts. The unloading slope of the engine is controlled to be smaller than that of the odd-numbered shaft clutch, so that the rotating speed of the engine is increased towards the rotating speed of the even-numbered shaft input shaft.
In addition, in this stage, the driving torque transmitted to the wheel end is reduced because the torque transmitted by the odd-numbered shaft clutch is reduced according to a certain speed, and the reduced driving torque of the wheel end is compensated by the driving torque of the motor, so that the total driving torque of the wheel end is kept unchanged, and the smoothness of the whole vehicle is ensured.
(3) In the third phase, a first torque interaction is achieved. During this phase, the engine crankshaft torque and the odd-shaft clutch transfer torque remain unloaded torque such that the engine speed is synchronized with the fourth gear speed. The transmission torque of the even-numbered shaft clutch is loaded at a certain speed, the engine crankshaft torque is transmitted to the path of the wheel end and is transferred to the even-numbered shaft clutch through the odd-numbered shaft clutch, and the driving torque transmitted to the wheel end is ensured to be consistent with the torque required by a driver, so that the smoothness of the whole vehicle is realized.
(4) In the fourth phase, the engine speed and the speed corresponding to the target gear are synchronized. During this phase, the engine torque continues to maintain the unloaded torque, the even axle clutch maintains its loaded transfer torque, and the odd axle clutch is unloaded to continue to ramp up the engine speed to the odd input axle speed corresponding to third gear. The even number shaft clutches execute sliding friction, and the driving torque transmitted to the wheel end is ensured to be consistent with the torque required by a driver, so that the smoothness of the whole vehicle is realized. And, the fifth gear of the engine gear is withdrawn and the third gear is engaged.
(5) In the fifth phase, a second torque interaction is achieved. In the stage, the transmission torque of the even-numbered shaft clutch is controlled to be unloaded according to a certain speed, the output torque of the engine is controlled to be loaded to the torque corresponding to the third gear according to a certain speed, and the transmission torque of the odd-numbered shaft clutch is controlled to be loaded to the torque corresponding to the third gear according to a certain speed. The engine crankshaft torque is transferred to the path of the wheel end from the even-numbered shaft clutch to the odd-numbered shaft clutch, so that the driving torque transferred to the wheel end is consistent with the torque required by a driver, and the smoothness of the whole vehicle is realized.
(6) And in the sixth stage, the odd-shaft clutch is locked, the engine crankshaft torque and the motor torque are recovered to normal torque values, and gear shifting is finished.
According to any one of the above embodiments of the invention, the dual clutch gear shift control of the dual clutch transmission hybrid electric vehicle is not limited to the original dual clutch gear shift control strategy, and is changed from the consideration of the interaction of a TCU (transmission control unit) and an EMS (engine electronic control unit) into the consideration of the whole hybrid power system, so that each stage of the gear shift process is decomposed one by one, and specifically, the clutch can be disconnected or the torque transmitted by the clutch is reduced according to the actual situation, so that the gear shift process similar to an AMT (automated mechanical transmission) is executed. The clutch is guaranteed to be unpowered to be interrupted or power is lost in the gear shifting process, smooth and quick gear shifting is achieved, sliding friction of the clutch in the gear shifting process is reduced, and the clutch is protected better.
In particular, the hybrid/plug-in hybrid vehicle developed based on DCT (dual clutch transmission) has a much heavier weight than the original vehicle, and the wear and tear of the dual clutch is increased due to the increased operating condition that the clutch slips and lifts the engine. In the actual development process, the double-clutch transmissions with the same type are found, the double clutches meet the requirements on the traditional fuel vehicle type, and the clutch ablation phenomenon occurs on the plug-in hybrid vehicle type. The problem of NVH (Noise Vibration and Harshness) caused by excessive wear of the clutch and even the problem of ablation damage of the clutch can be avoided through the embodiment of the invention.
It should be noted that, the invention describes the gear shift control method by taking the power downshift of the engine as an example, and the control strategy concept is still applicable to other gear shift conditions such as the engine upshift, and is not repeated in the embodiment of the invention.
An embodiment of the present invention further provides an intelligent gear shifting device based on a dual clutch, as shown in fig. 8, the intelligent gear shifting device 4 includes:
a gear acquiring module 401, configured to acquire a current gear and a target gear of a vehicle;
a preset condition determining module 402, configured to determine whether the current gear and the target gear meet a preset condition;
a rotation speed synchronization control module 403, configured to respectively control an output torque unloading of a first power device and a transmission torque unloading of a current clutch if the vehicle gear shift meets a preset condition, so as to synchronize a rotation speed of the first power device with a rotation speed corresponding to the target gear;
and an engagement control module 404, configured to control the output shaft of the first power device and the current clutch to be gradually opened and gradually engaged with a target clutch after the rotation speed of the first power device is synchronized with the rotation speed corresponding to the target gear, so that the output torque of the first power device is synchronized with the torque corresponding to the target gear.
The embodiment of the invention also provides intelligent gear shifting equipment based on double clutches, which is characterized by comprising a processor and a memory, wherein at least one instruction or at least one program is stored in the memory, and the at least one instruction or the at least one program is loaded and executed by the processor to realize the intelligent gear shifting method.
The embodiment of the present invention further provides a computer-readable storage medium, where at least one instruction or at least one program is stored in the storage medium, and the at least one instruction or the at least one program is loaded and executed by a processor to implement the intelligent gear shifting method according to any of the above descriptions.
The embodiment of the invention also provides a gear shifting system based on the double clutches, which comprises the intelligent gear shifting device, the first power device, the second power device and the double clutches;
the first power device and the second power device are respectively connected with the double clutches; the intelligent gear shifting device is used for acquiring the current gear and the target gear of the vehicle; judging whether the vehicle gear shifting meets a preset condition or not according to the current gear and the target gear; if the vehicle gear shifting meets a preset condition, respectively controlling the output torque unloading of a first power device and the transmission torque unloading of a current clutch so as to enable the rotating speed of the first power device to be synchronous with the rotating speed corresponding to the target gear; and after the rotating speed of the first power device is synchronous with the rotating speed corresponding to the target gear, controlling the output shaft of the first power device to be gradually opened with the current clutch and gradually engaged with the target clutch so as to enable the output torque of the first power device to be synchronous with the torque corresponding to the target gear.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus, system and server embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. An intelligent gear shifting method based on double clutches is characterized by comprising the following steps:
acquiring a current gear and a target gear of a vehicle;
judging whether the current gear and the target gear meet preset conditions or not, wherein the preset conditions comprise that the target gear is smaller than the current gear;
if the vehicle gear shifting meets a preset condition, respectively controlling the output torque unloading of a first power device and the transmission torque unloading of a current clutch so as to enable the rotating speed of the first power device to be synchronous with the rotating speed corresponding to the target gear;
after the rotating speed of the first power device is synchronous with the rotating speed corresponding to the target gear, controlling an output shaft of the first power device to be gradually opened with the current clutch and gradually engaged with the target clutch so as to enable the output torque of the first power device to be synchronous with the torque corresponding to the target gear;
wherein the content of the first and second substances,
if the target gear and the current gear are adjacent gears,
the separately controlling the unloading of the output torque of the first power unit and the unloading of the transfer torque of the present clutch includes:
controlling the output torque of the first power device to be unloaded according to a first slope, and controlling the transmission torque of the current clutch to be unloaded according to a second slope, wherein the first slope is smaller than the second slope;
if the target gear and the current gear are interval gears,
the separately controlling the unloading of the output torque of the first power unit and the unloading of the transfer torque of the present clutch includes:
controlling the output torque of the first power device to be unloaded according to a third slope, and controlling the transmission torque of the current clutch to be unloaded according to a fourth slope, so that the current clutch is released from a locking state, wherein the third slope is smaller than the fourth slope;
when the current clutch is unlocked, controlling the output torque of the first power device to be transferred from the current clutch to an intermediate clutch so that the intermediate clutch performs friction control on the first power device;
and after the output torque of the first power device is transferred from the current clutch to the intermediate clutch, controlling the transfer torque of the target clutch to be unloaded so as to synchronize the rotating speed of the first power device with the rotating speed corresponding to the target gear.
2. The dual-clutch-based intelligent gear shifting method according to claim 1, wherein if the target gear and the current gear are adjacent gears, the controlling the output shaft of the first power unit to be gradually opened with the current clutch and gradually engaged with the target clutch comprises:
when the output shaft of the first power device and the current clutch are controlled to be gradually opened, controlling the transmission torque of the target clutch to be loaded so that the transmission torque of the target clutch is loaded to the torque corresponding to the target gear;
and when the transmission torque of the target clutch is loaded to the torque corresponding to the target gear, controlling the output shaft of the first power device to be gradually engaged with the target clutch.
3. The dual clutch-based intelligent shifting method according to claim 1, wherein if the target gear and the current gear are adjacent gears, before controlling the output torque unloading of the first power unit and the transfer torque unloading of the current clutch, respectively, the intelligent shifting method further comprises:
and controlling the target clutch to perform pre-gear engagement so that the target clutch is pre-engaged to the target gear.
4. The dual-clutch-based intelligent gear shifting method according to claim 1, wherein if the target gear and the current gear are interval gears, the controlling the output shaft of the first power unit to be gradually opened with the current clutch and gradually engaged with the target clutch comprises:
when the output shaft of the first power device and the intermediate clutch are controlled to be gradually opened, controlling the transmission torque loading of the target clutch and the output torque loading of the first power device so as to load the transmission torque of the target clutch to the torque corresponding to the target gear;
and when the transmission torque of the target clutch is loaded to the torque corresponding to the target gear, controlling the output shaft of the first power device to be gradually engaged with the target clutch.
5. The dual clutch-based intelligent shifting method according to claim 1, wherein if the target gear and the current gear are the interval gears, before controlling the output torque unloading of the first power unit and the transfer torque unloading of the current clutch, respectively, the intelligent shifting method further comprises:
controlling the intermediate clutch to pre-engage to enable the intermediate clutch to pre-engage to an intermediate gear;
and after controlling the output shaft of the first power unit to be gradually opened with the current clutch and gradually combined with the intermediate clutch, and before controlling the output shaft of the first power unit to be gradually engaged with the target clutch, the smart shift method further includes:
and controlling the target clutch to perform pre-gear engagement so that the target clutch is pre-engaged to the target gear.
6. The dual clutch-based intelligent shifting method according to any one of claims 1-5, further comprising:
and when the transfer torque of the current clutch is controlled to be unloaded, compensating the transfer torque of the current clutch through a second power device so as to enable the driving torque of the wheel end of the vehicle to be unchanged.
7. Double clutch based intelligent gearshift device, characterized in that the intelligent gearshift device (4) comprises:
the gear acquisition module (401) is used for acquiring a current gear and a target gear of the vehicle;
a preset condition judgment module (402) for judging whether the current gear and the target gear meet a preset condition, wherein the preset condition includes that the target gear is smaller than the current gear;
a rotating speed synchronization control module (403) for respectively controlling the output torque unloading of the first power device and the transmission torque unloading of the current clutch if the vehicle gear shift meets a preset condition, so as to synchronize the rotating speed of the first power device with the rotating speed corresponding to the target gear;
an engagement control module (404) for controlling the output shaft of the first power device to be gradually opened with the current clutch and gradually engaged with a target clutch after the rotation speed of the first power device is synchronized with the rotation speed corresponding to the target gear, so that the output torque of the first power device is synchronized with the torque corresponding to the target gear;
wherein the content of the first and second substances,
if the target gear and the current gear are adjacent gears, the rotating speed synchronous control module (403) is further used for controlling the output torque of the first power device to be unloaded according to a first slope and controlling the transmission torque of the current clutch to be unloaded according to a second slope, and the first slope is smaller than the second slope;
if the target gear and the current gear are spaced gears, the rotating speed synchronous control module (403) is further configured to control the output torque of the first power device to be unloaded according to a third slope, and control the transmission torque of the current clutch to be unloaded according to a fourth slope, so that the current clutch is released from a locked state, and the third slope is smaller than the fourth slope; when the current clutch is unlocked, controlling the output torque of the first power device to be transferred from the current clutch to an intermediate clutch so that the intermediate clutch performs friction control on the first power device; and after the output torque of the first power device is transferred from the current clutch to the intermediate clutch, controlling the transfer torque of the target clutch to be unloaded so as to synchronize the rotating speed of the first power device with the rotating speed corresponding to the target gear.
8. A computer readable storage medium, wherein at least one instruction or at least one program is stored in the storage medium, and the at least one instruction or the at least one program is loaded and executed by a processor to implement the dual clutch based intelligent gear shifting method according to any one of claims 1 to 6.
9. A dual clutch based shifting apparatus, characterized in that the apparatus comprises a processor and a memory, wherein at least one instruction or at least one program is stored in the memory, and the at least one instruction or the at least one program is loaded and executed by the processor to realize the dual clutch based intelligent shifting method according to any one of claims 1 to 6.
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